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Separating the Wheat from the Chaff: Understanding "Background" in Environmental Apportionment and Other Applications
Chemicals such as dioxins, PCBs, PAHs, arsenic, cadmium, lead, mercury, and petroleum hydrocarbons are ubiquitous in the environment as a result of numerous regional and local sources from sites of interest. When determining the risks or contributions associated with a specific source (e.g., an incinerator, a manufacturing facility, or a waste disposal location), it is important to distinguish that source from "background." This 60-minute webinar will feature several of Exponent's leading environmental chemists and NRD specialists who are actively engaged in establishing background conditions in a wide variety of contexts as part of divisibility and apportionment determinations, as well as for risk assessments, remedial decisions, and NRD baseline determinations. Our talk will describe the general issues of establishing background concentrations, identify how to best measure and characterize these conditions, and how to use site-specific or other published data in cases involving contribution, damages, risk assessments, and the planning of remediation. We will address both federal and state regulatory definitions, and present case studies to illustrate the sampling designs and appropriate techniques used to define and characterize background conditions. Speakers: Walt Shields, Ph.D., C.P.S.S. Tarek Saba, Ph.D. Anne Fairbrother, D.V.M., Ph.D. Click here to play the event recording
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